Level 45 - Top left corner of the screen. Easy to reach.
Level 59 - Top right corner of the screen. Jump at the middle demon to grab the key, then ascend up left to pick up the second key. From the top left, jump to the middle brick, and then the rightmost area to grab the bird.
DO NOT TAKE THE THIRD KEY BEFORE GETTING THE BIRD - THE LEVEL ENDS IMMEDIATELY IF YOU DO SO.Video from Cheevo Guides (posted with permission - refer to 8:54 for the first bird, and 12:40 in the video for the two birds)